Wrench



Feb. 21, 1928.

- 1,660,208 A. J. PREINING WRENCH Filed Jan: 21. 1926 YNVENTOR. rfmzf f Fez/Mae A TTORNE Y.

Patented Feb. 21, 1928.

"UNITED STATES .ADOLF J. rnnmnve. or nnrrnorr, MICHIGAN.

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Application filed January 21, 1926. Serial No. 82,654.

, This invention relates to wrenches and the objectof the invention is to provide a wrench in which the head is pivoted in, relation to the handle whereby upon turning the handle the jaws of the wrench are moved together to grip a nut.

Another object of the invention is to provide a wrench which may be adjusted from the maximum to the minimum by a comparatively small movement of the handle.

Another object of the invention is to provide a wrench in which the turning of the handle to turn the nut also tends to more firmly grip the nut in the wrench jaws.

Another object of the invention is to provide a wrench in which the pressure applied in gripping the nut increases with the size of the nut. V These objects and the several novel features of the invention are hereinafter more fully described and claimed and the pre-' ferred form of construction by which these objects are attained is shown in the accom panying drawings in which- Fig. 1 is a view with the cover plate removed, of a wrench embodying my invention in the open position.

Fig. 2'is a similar view thereof in the closed position.

Fig. 3 is a section taken on line 3-3 of Pi 1.

Fig. 4 is a section taken on line 4-4 of Fig. 1.

Fig. 5 is a perspective view of the stationary wrench jaw. 1

Fig. 6 is an elevation of the wrench head.

As shown in Fig. 5 the wrench comprises a head or plate 1 having a wrench aw 2 formed integrally therewith. A pair of lugs 3 and 4 are also formed integrally w th the plate 1. The plate 1 is provided with agroove 5 thereacross and the movable aw 6 shown in Fig. 2 is provided with a rib 7 riding in the groove 5 as will be understood from Figs. 4 and 5. As will be understood from Fig. 1.the movable jaw 6 when positioned in the head 1 rides on the lugs 3 and 4 and beneath the jaw 2. The handle 8 shown in Figs. 1,2 and 3 is provided with a cylindrical portion 9 fitting between the lugs3 and 4 which form a bearing for the portion 9 in the wrench head and when so positioned in the head the lever 8 may be turned with the portion 9 acting as a bearing. By this arrangement the handle is pivotally mounted in the head and the handle is provided withga tooth 12 engaging in the notch 13 in the movable jaw 6. When thejaws 2 and 6 are fully opened, as shown in Fig. 1 the base of the tooth 12- engages the adjacent portion of Y the jaw member 6 so that the leverage in gripping a large nut is much greater than the leverage applied in gripping a small nut. In the position shown in Fig. 2 the top of the tooth 12 engages the wall of the notch 13 which decreases the applied leverage when the wrench is usedon smaller nuts. By this arrangement the gripping effect of the jaws engaging the nut is increased with the size of the nut and this difierential in leverage is very important as 'itis comparatively easy to turn the small nuts while it is increasingly difficult to turn the large nuts. The coverplate 11 may be fastened to the jaw 2 and the lugs 3 and 4 by the screws 14 or may be welded to these members 'if desired.

To operate the wrench the jaws are fully opened by moving the handle 8 to the position shown in Fig. 1 at which timethe face of the movable jaw 6 may be positioned against the nut to be turned. At this time the handle 8 is moved to the left of Fig. 1 thus moving the jaws together to engage the corresponding faces of the nut at which time further movement of the handle 8 to the left of Fig. 1 turns the nut. The wrench may be easily disengaged from the nut by reversing the movement of the handle 8 slightly. By an oscillating movement of the handle 8 the wrench may be used similar to a ratchet wrench as the jaws are released and engaged again on succeeding faces of the nut during such oscillating movement of the handle. By means of the lever and notch the handle moves through an arc of about sixty degrees to produce a maximum movement of the wrench jaws and as the tooth-12 of'the lever is quite thick it is practically impossible to break this end off even when using the wrench to remove nuts which are very tight.

From the foregoing description it becomes evident that the device is very simple and eflicient in operation, is composed of few parts and is of consequent lowmanufacturing' cost and provides a device which accom plishes the objects described.

' Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the UnitedvfSt ates' isa A 1. A wrench comprising a head havinga stationary jaw and a pair of lugs spaced therefrom, a movable jaw lno vable versely of the head and having a portion movable between the stationary jaw and the said lugs, there being a rib on the said porhandle having a circular portion adjacent one end; said lugs being shaped in oppo'sed faces to receive the said circular portion of the handle whereby the same is pivotally supported between the lugs, there being fa tooth carried. byfthe handle engaging; in" the notch in the 'n'1ovable jaw portion; thearrangin'ent being such that the leverage vapplied turning" the handlein gripping. a large nut is greater than the leverage' applied in gripping' a small nut.

c 21 A wrench comprising a head having a stationary jaw and-a pair oflugs spaced therefrom; a movable jaw movable transverselyfofthe head and h aving a portion movable between the stationary 'j aw and the said lugs, there being a rib in the said portionfof the movable jaw, the head being pro vided with a groove in which the said rib is" adapted to ride, the said portion of the movl b e...;jaw.-,heing; prov With a notch,

handle pivotally mounted in the head and having an endengaging in the said notch, said handle furtherhaving a circular portime with which i said end is integrally formed, said luvs being in spaced relation and having? opposed race formed to receive the circular qrtio bt' the handle and pro vidirig alpivotal mountingtherefor] A .wre"nch comprising head having a stationary aw and apairotlugs spaced therefrom, a l handle .pivotally mounted in thesaidhead' and supportechiii its pivotal e rem b tl i d te e" f va'b. j ir resting on thesaid lugs and extending" be n-eath thestationary jaw, there being arib onthe movable jaw, the beta being-provided with a transverse groove in whichthe said rib is I adapted to ride, the movable jaw being provided With a notch in'which the end oi a dlhan n ge 7 y testimony whereof I sign this specificatiOnQ" Y ADOLF J; PREi NINZGQ 

